244 ROGK GARDENING FOR AMATEURS 



soil, especially amongst stones. 0. linifolia is a pretty 

 Portuguese annual, ten or twelve inches high, with 

 glaucous green leaves and pure white flowers in summer. 

 Autumn-sown seeds produce plants which flower in the 

 late spring, while if seeds are sown at intervals from April 

 to June a succession may be obtained throughout the 

 summer and autumn. 



Ononis. The species of chief value for the rock 

 garden are low sub-shrubby plants, bearing Pea-shaped 

 flowers (natural order Leguminosae) . They thrive in light 

 soil and a sunny spot. Ononis fruticosa, from Spain 

 and Southern France, has purplish blooms in June, 

 and grows about eighteen inches high. O. rotundifolia 

 is rather smaller, having rose-coloured flowers, while O. 

 arvensis, our native Rest Harrow, with pinkish blooms, 

 is also worth growing in the rock garden. Propagated 

 by seeds sown in late summer or spring. 



Oxalis (Wood Sorrel). Some of the hardy kinds of 

 Oxalis are attractive rock plants (natural order Gera- 

 niaceae), notably Oxalis enneaphylla, from the Falkland 

 Islands. This has beautiful, silvery leaves, and large 

 pale rose flowers ; there is a white variety. 0. adeno- 

 phylla, with rose-white blooms, is also very charming. 

 The pink variety of the common wood sorrel (0. acetosella 

 rosea) is worth growing, and O. corniculata, with yellow 

 flowers, is useful for carpeting and planting in stone 

 steps. The Wood Sorrels like a soil consisting of loam 

 and leaf-mould or peat, with sand ; they are happiest 

 in half-shade. Propagation is by offsets or by seeds. 



